icuSources/test/perf/unisetperf/draft/trieset.cpp

   1 /*
   2 *************************************************************************
   3 *   © 2016 and later: Unicode, Inc. and others.
   4 *   License & terms of use: http://www.unicode.org/copyright.html#License
   5 *************************************************************************
   6 *************************************************************************
   7 *   Copyright (C) 2007, International Business Machines
   8 *   Corporation and others.  All Rights Reserved.
   9 *************************************************************************
  10 *   file name:  trieset.cpp
  11 *   encoding:   UTF-8
  12 *   tab size:   8 (not used)
  13 *   indentation:4
  14 *
  15 *   created on: 2007jan15
  16 *   created by: Markus Scherer
  17 *
  18 *   Idea for a "compiled", fast, read-only (immutable) version of a UnicodeSet
  19 *   using a UTrie with 8-bit (byte) results per code point.
  20 *   Modifies the trie index to make the BMP linear, and uses the original set
  21 *   for supplementary code points.
  22 */
  23
  24 #include "unicode/utypes.h"
  25 #include "unicont.h"
  26
  27 #define UTRIE_GET8_LATIN1(trie) ((const uint8_t *)(trie)->data32+UTRIE_DATA_BLOCK_LENGTH)
  28
  29 #define UTRIE_GET8_FROM_LEAD(trie, c16) \
  30     ((const uint8_t *)(trie)->data32)[ \
  31         ((int32_t)((trie)->index[(c16)>>UTRIE_SHIFT])<<UTRIE_INDEX_SHIFT)+ \
  32         ((c16)&UTRIE_MASK) \
  33     ]
  34
  35 class TrieSet : public UObject, public UnicodeContainable {
  36 public:
  37     TrieSet(const UnicodeSet &set, UErrorCode &errorCode)
  38             : trieData(NULL), latin1(NULL), restSet(set.clone()) {
  39         if(U_FAILURE(errorCode)) {
  40             return;
  41         }
  42         if(restSet==NULL) {
  43             errorCode=U_MEMORY_ALLOCATION_ERROR;
  44             return;
  45         }
  46
  47         UNewTrie *newTrie=utrie_open(NULL, NULL, 0x11000, 0, 0, TRUE);
  48         UChar32 start, end;
  49
  50         UnicodeSetIterator iter(set);
  51
  52         while(iter.nextRange() && !iter.isString()) {
  53             start=iter.getCodepoint();
  54             end=iter.getCodepointEnd();
  55             if(start>0xffff) {
  56                 break;
  57             }
  58             if(end>0xffff) {
  59                 end=0xffff;
  60             }
  61             if(!utrie_setRange32(newTrie, start, end+1, TRUE, TRUE)) {
  62                 errorCode=U_INTERNAL_PROGRAM_ERROR;
  63                 return;
  64             }
  65         }
  66
  67         // Preflight the trie length.
  68         int32_t length=utrie_serialize(newTrie, NULL, 0, NULL, 8, &errorCode);
  69         if(errorCode!=U_BUFFER_OVERFLOW_ERROR) {
  70             return;
  71         }
  72
  73         trieData=(uint32_t *)uprv_malloc(length);
  74         if(trieData==NULL) {
  75             errorCode=U_MEMORY_ALLOCATION_ERROR;
  76             return;
  77         }
  78
  79         errorCode=U_ZERO_ERROR;
  80         utrie_serialize(newTrie, trieData, length, NULL, 8, &errorCode);
  81         utrie_unserialize(&trie, trieData, length, &errorCode);  // TODO: Implement for 8-bit UTrie!
  82
  83         if(U_SUCCESS(errorCode)) {
  84             // Copy the indexes for surrogate code points into the BMP range
  85             // for simple access across the entire BMP.
  86             uprv_memcpy((uint16_t *)trie.index+(0xd800>>UTRIE_SHIFT),
  87                         trie.index+UTRIE_BMP_INDEX_LENGTH,
  88                         (0x800>>UTRIE_SHIFT)*2);
  89             latin1=UTRIE_GET8_LATIN1(&trie);
  90         }
  91
  92         restSet.remove(0, 0xffff);
  93     }
  94
  95     ~TrieSet() {
  96         uprv_free(trieData);
  97         delete restSet;
  98     }
  99
 100     UBool contains(UChar32 c) const {
 101         if((uint32_t)c<=0xff) {
 102             return (UBool)latin1[c];
 103         } else if((uint32_t)c<0xffff) {
 104             return (UBool)UTRIE_GET8_FROM_LEAD(&trie, c);
 105         } else {
 106             return restSet->contains(c);
 107         }
 108     }
 109
 110 private:
 111     uint32_t *trieData;
 112     const uint8_t *latin1;
 113     UTrie trie;
 114     UnicodeSet *restSet;
 115 };